Phonograph reproducer diaphragm



To @ZZ whom vmay concern.'

i Be it known that l, lVriirnrm-Lm a subject of the King; of Great Britain. and a resident oi fTiet-oria, Tancourer Island, in "llx1evince o'f British Columbia7 Dominion of Canada, have invented certain new useful mrrovements in P'io-nograph Reproducer Uiaphragms, of which the Iollcving is a specification.

lvl] invention relates to improvements 1n phonograph reproducers, it being more particularly an improvement in reproducer diaphragms, and it consists'y in the construction.,v combination and arrangement substantially as herein described and claimed.

@ne of the 'foremost objects i' the inven- .tion is to provide areproducer diaphragm composed of a plurality of suitably assembled preferably Wooden sectors, so treated before assembly, in the manner described below, to confer qualities thereto which enable the diaphragm to render perfect reproductions.

A further object of the invention is to provide an improved diaphragm composed oi2 peculiarly treated Wooden sectors ot suitable numbensize and predetermined formation, so mounted on a parchment or like base .l 1 as to produce a strong; diapnragm out one which is capable of cooperating in the re' production ofsounds to a high degree faithfulness, due to the arrangement and resonance of said Wooden sectors.

@ther objects and advantages will appear in the following; speciiication, reference bed ing had to the accompanying drawing, in

.reproducer diaphragm, illustratinge allicht- Figure l is a plan view of the improved arrangement orn the Wooden sectors ano. also clearly showing how the grain of the Wood converges to center7 Figure 2 is a detail view of one Wooden sectors,

Figure 3 is an end 'the viewr showing` how the sector tapers in thickness toward the center.,

Figure d is a cross section or" tLA e pfhragm, taken on the lin oi lesser numbenof sectors as particular conf' ditions may require. f

is clearly shown in Figures 3 and Il, 'the Wooden sectors are thicker at the outer edge 2 than they are at the point 3, in other Words7 the sectors taper down toward the enter Where a suitable opening l is provided to enable the attachment in any desired manner. ot the usual stylus bar of the reproducer. The sectors are assembled and suitably secured to a parchment or like base 5, drum .head parchment preferably being employed. .The sectors are ozonized in a vacuum. this treatment causing the hardening' or the gums of the Wood in the pores so that a greater degree of resonance is produced.

Wood when so treated, a degree of elasticity more than double its ordinary amount.

t is further to be observed that the sections are cut from quarter-sawed Wood in order that the grain or liber of the 'Wood may all run to the cent-er or" the diaphragm when the sectors are assembled on the parchment base 5. rlhis converging disposition of the fibers is 'clearly illustrated in Figure l, this arrangement permitting the sectors to vibrate in unison.

Tlhile the construction and arrangement oit ne improved diaphragm as herein described and claimed3 is that of generally preferred t'orm,.obviously modifications and changes may be made Without departingfrom the spirit the invention or the scope of tine claims.

r diapnragm, composed mounted on a parchable the convergence of the grain toward the able ille convergence of the grain toward the Center for uniform vibration. Center for uniform vibration; said sectors i2. A reproducer diaphragm, composed of having been ozonzod in a vacuum to harden 10 a plurality 'of Sectol's` mounted on apalchthe, gum in the pores of the Wood for the o ment or like buse, all sectors cross seotionproduction of u greater degree of regonance. ally tapering in thickness toward the center and consisting of quarter-sawed 'Wood to en CHARLES WVHTEFIELD. 

